docs(fvp): update loading addresses of HW_CONFIG

As per change [1], now HW_CONFIG gets loaded in secure and
non-secure memory. Hence updated the documentation to show
secure and non-secure load region of HW_CONFIG in FVP Arm
platform.

Additionally, added a note on how FW_CONFIG address gets
passed from BL2 to BL31/SP_MIN.

[1]: https://review.trustedfirmware.org/c/TF-A/trusted-firmware-a/+/14620

Change-Id: I37e02ff4f433c87bccbe67c7df5ecde3017668b9
Signed-off-by: Manish V Badarkhe <Manish.Badarkhe@arm.com>
1 file changed